質量数の記事

This is a diagram that explains AZE notation. On the left is a model of an atom, with a nucleus in the middle consisting of two circular protons marked with a "+" symbol tightly placed next to two blue neutrons. A ring surrounds the nucleus, containing two circular electrons that are smaller than the neutrons and the electrons. A description for protons says in a neutral atom they are the same as the number of electrons. On the right is the AZE notation of Helium, with the chemical symbol He with a superscript and subscript to the left of the symbol. The superscript, 4, is the atomic / mass number, the sum of the protons and neutrons. The subscript, 2, is the number of protons.

原子番号の基礎知識元素を定義する正体とその歴史

原子番号陽子数周期表ヘンリー・モーゼリー

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核物理学における質量数と原子構造の基礎

核物理学質量数原子番号同位体

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